to expand on this: the closer a router's (and the devices connected to it) sync is with the clocks the backbone of the internet rely on, the more certain and smooth their operation will be.
Running an ntp server on your local network for your devices to look to locally rather than going off-site will keep everything ridiculously accurate and humming along so smoothly:
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every so often you might be watching something on TV where the sound you hear doesn't match with the lips you see moving on screen - and your brain starts to wonder what's going on...the same thing happens with routers and other devices on down the line, and the further they are from a time source that keeps everything where it's supposed to be (
in time), the less likely things will be because of delays and drift. 3.209 ppm clock drift...the Internet Exchange where my ISP hosts its servers runs a stratum 1 pool of 3 atomic clocks, and I'm only a ~7ms ping away.